Abstract
Metaultramafic rocks (serpentinite, talc and chlorite schist) occur intercalated in the metassediments of the Araxa Group and the Granite-Gneissic Terrains in the southwest portion of the Sao Francisco Craton, inner part of the Brasilia Belt, southeastERN Tocantins Province. These rocks represent lenses displayed parallel to the regional foliation. Textural and structural data suggest that the metaultramafic rocks are tectonically emplaced during the pre to sin D n deformation and that the lenses preserve their nucleus without deformation. Primary textures and mineralogy are not more present. The typical mineral assemblage belong to the green schist facies and are generated under static conditions during the final stage of the development of the regional foliation. Primary relict textures suggest that the protolith of the serpentinite and or talc schist are cummulatic olivine and pyroxene rich rocks. Chemical data suggest a dunite to peridotite protolith. Geochemical signatures, types of occurrences, the observed textures and structures, the presence of cromitite lenses, indicating alpine type complexes characterize ophiolitic fragments (ophiolite melange).
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